Apparatus for speed control for lathes.



H. KIENZLE.

APPARATUS FOB SPEED 00mm; FOR LATIHUES.

APPLICATION FILED APR. 23, 1914.

il llfifi n Patantedl Feb. 116, 11.915.

2 SHEBTHHEET 1.

HERBERT NZLE, OF NEW YORK, N. Y.

APPARATUS FOR SPEED CONTROL FOR LATHES.

To all whom it may concern:

Be it known that I, HERBERT KIENZLE, a sub ect of the Emperor of Germany, residing in the city, county,. and State of New York, have invented certain new and useful Improvements in Apparatus for Speed Control for Lathes, of which the following is a specification.

My improvement relates toelectric motor driven hand or automatic turret lathes, and has for its object the automatic variation and control of the speeds of the work spindle; which control is effected by regulating the current supplied to the electric-motor through mechanism connected therewith between it and the turret.

The main feature of my improvement consists in changing therotative speeds of the work during the various operations performed thereon by the various tools carried in the turret, so that each tool will have its cutting speed varied in such manner as to obtain the most efficient production of work, during the operation of said tool. As is well known drilling tools, box tools, reamers, formers, and shaving tools all require certain speeds in order to obtain their greatest efficiency and this improvement ena'bles these changes of speeds to be made practically coincident with the entering of the tool into the working axis. y

Figure 1 is an end elevation 6f a turret lathe showing the motor control mechanism; Fig. 2 is a side elevation showing, in dotted lines, the connection of the turret with the motor'control mechanism; and Fig. 3 is an enlarged view of the transmission gearing and speed control, partly in section.

In Fig. 2 there is shown the usual plural tool-holding turret 1, mounted on a turretslide 2 for advancing and retracting the tools to and from the work, and simultaneously presenting new tools progressively to the work in the usual manner, and a constantly rotating work. spindle 41. The turret 1 is fixedly attached toa pivot 3 rota- .tably mounted on the slide 2, and to the lower end of which is aflixed a miter gear "4 which meshes with a miter gear '5 splined to a shaft 6, which shaft 6 is rotatably mounted in bearings 7 and 8 provided therefor on the lathe bed 9. On the opposite end ofthe shaft 6 from themiter gear 5, there is fixedly attached 'a chain sprocket 11 nected by a chain 12 to another chain Specification of Letters Patent.

Patented Feb. 16, 1915.

Application filed Apri123, 1914. Serial No. 833,868.-

sprocket 13 fixedly attached to a rotatable shaft 14 mounted in the lower portion of the bed 9. On the shaft 14 there is fixedly mounted a cam-receiving disk 15 to which is removably attached a. cam 16. In a bearing 17 there is mounted a stud 18 which.

pivotally supports a gear sector 19. On the small end of the sector 19 there is revolubly mounted a roller 20 which bears against the side of the disk '15 and the face of the cam 16. The toothed portion of the sector 19 meshes with a gear 21 fixedly attached to one end of a spindle 22 which is rotatably mounted in bearings 23 and 24 in astarting (or resistance) box 25 Sup 42 which is connected to drive the work spindle 41 by means of gearing 43, the wiring 44 thereof being shown broken ofl' in Fig. 2.

The method of operation is as follows:'

Upon the advancement of any given tool carried by the turret into the working axis a, the cam 16 on the cam disk 15 is partially rotated. If the turret carries six tools there will be six predetermined divisions or cam faces 2), more or less, according to the requirements. The advance or lead of cam face 6 corresponds to the required speed control of the spindle, and in synchronism with which the tool-operates. The turret is drawn backward in the usual manner and this action partially rotates the same. This rotation is transmitted through the miter gears 4 and 5 to the splined shaft 6 with which the mitered gear 5 is in sliding engagement. It will be noted by referring to Fig. 3, that this miter gear 5 isso carried in the bearing 10 as to be movable with. the turret slide 2 along shaft 6, thereby keeping it in constant mesh with its corresponding miter gear 4 at all -positionsof the turret slide. The partial rotary transmission of the shaft 6 is transmitted through the sprockets 11 and 13 and through chain 12 to the cam disk shaft 14 This movement too distance 7;, thereby operating the roller end of the gear sector 19, which causes the sector to move to operate the starting box gear .21 which in turn throws the contact 31 around to the position required to cause the motor to rotate at the given speed. It will be noted that this change of speed control takes place upon the retraction of the turret from the work spindle.

For the purpose of maintaining the sector roller. 21 upon the face of cam 16, there is fixedly mounted on the outer end of the brush spindle 22, a sprocket 27 upon which sprocket is laid a chain 28, one end of said ohaincarrying suflicient weight 29 to overcome the weight of the sector in such manner as-to keep it in contact at all times with the working face of the removable cam 16.

It is obvious that in machines of the foregoing described type, where it is necessary to set them up.- for various 10b8, the sequence of tools progressively used is also varied. Therefore the cam 16 must be so. arranged as to produce the different progressive controls required in different series of operations. For this reason the cam 16 is removably mounted upon this actuated disk 15, so that it may be substituted for cams bearing other required speed-changing faces.

Having thus described my invent on, I claim:

1. In aspeed control mechanism for turret lathes, the combination with a tool-holding turret, a work spindle, and means for rotating said spindle, of a shaft, a cam on said shaft, gearing connecting said shaft with said turret so that said shaft is rotated when said turret is actuated, a sector in contact with said cam. to be operated thereby, speed changing mechanism provided for said spindle rotating means and operated by said sector, and connecting means connecting said spindle rotating means with said work spindle.

2. 'In a speed control mechanism for turret'lathes,the combination with a tool-holding turret, a work spindle, and means for rotating said spindle, of a cam connecting means whereby said cam is actuated by said turret, a shaft, a gear on said shaft, an electrical contact brush on said shaft, contacts Wired to said spindle rotating means, and a sector in contact with said cam meshing with said gear, whereby upon the advance of the turret the rotation of the work spindle is varied according to the pre-arrangement of thecam.

3. In a speed-control mechanism for turret elathes, the combination wlth a toolwholding turret, a work spindle, means for rotating said spindle, a shaft, and gearing connecting said shaft to said turret, of a disk a tached to said shaft, acam removably attach d tosaid disk, a second shaft, a gear varied according to the pro-arrangement of the cam.

4:. In a speed control mechanism for turret lathes,- the combination with a tool holding turret, a work spindle, means for rotating said spindle, a shaft, and a gearing connecting said shaft to said turret, of a cam attached to said shaft, a second shaft, an electrical contact brush on said second shaft, contacts for said brush, wires for connecting saidcontacts to said spindle rotating means, a resistance box operatively connected to said wires to change the. speed of said second shaft when said resistance box is changed, and controlling means for operatively connecting said cam to said controlling means to control said resistance box by said cam.

5. In a speed control mechanism for turret lathes, the combination with a tool'holdingturret, a work spindle, and an electric motor for rotating said spindle, of a shaft, gearing connecting said shaft to said turret, a cam on said shaft, a resistance box connected to said motor, controlling means for changing said resistance box thereby to change the speed of said motor and therewith the speed of said spindle, and connecting means for operatively connecting said cam to said controlling means to control said resistance box by said cam.

6. Ina speed control mechanism for turret lathes, the combination with a revoluble plural tool-holding turret, a rotatable work spindle, and an electric motor for rotating said spindle continuously, of a shaft, gearing connecting said turret with said shaft so that the rotation of said turret will actuate said shaft, a cam attached to said shaft,

electrical resistance means connected to said motor whereby the speed of the motor and therewith the speed of the work-holding spindle may be varied and controlled to suit the tool being used, and connecting means connecting said cam with said resistance meansso that the movement of said cam affects said resistance means.

7 In a speed control mechanism for turret lathes, the combination with a tool-holding turret, a work-spindle, and an electrical motor for rotating said spindle, of a cam, connecting means between said turret and said cam. so thatsaid cam is actuated whenever said turret is actuated, clectrical resistance means connected to said motor, controlling means for changing said resistance means to change the speed of said motor and greener tool holding turret whereby the said resistw ence is operated to control the amount of current supplied to said motor and thereby vary its speed.

HERBERT KIENZLE.

Witnesses HENRY D. SHARPE, THOMAS F. Semen. 

